Process for treating yarns



FTPSSO S R isolzflee Patented Aug. 27, 1935 UNITED STATES ig irirmisiuuu:

PATENT QFFEQE PROCESS FOR TREATING YARNS Louis Peufaillit, Paris, FranceNo Drawing. Application February 9, 1933, Serial No 656,046. In FranceAugust 26, 1932 9 Claims.

When manufactured industrially, yarn is always boiled prior to beingcreamed and bleached, such boiling operation consisting in treating theyarns in the hot state in leaching apparatus in the presence of sodiumcarbonate and caustic soda. The yarn is then bleached by the knownmethods.

I have observed that it is possible to do away with this boilingoperation and to prepare the yarns for bleaching by simply soaking themcold. Such soaking has the advantage of avoiding comber waste, of notweakening the yarns and of making them extremely soft and pliable.Furthermore, thi operation gives fine creamy tints, without it beingnecessary to use chlorine.

The process according to the invention is applicable to all yarnswhether hemp, fiax, sisal, jute, cotton or others and. may be applied inthe same way for all.

The process is carried out in the following manner:---

A bath is prepared containing aluminum sulphate and a reducing saltderived from sulphur, such as bi-sulphite, sulphite, hyposulphite ormetabisulphite of an alkaline base weakly concentrated. The yarns areimmersed in this bath either in suitable known machines or in vats. Thecolor soon turns to yellow and in the case of cotton it rapidly turns toa fresh butter cream. The yarn is then removed from the bath, rinsed inwater and if a white color is desired, it is then bleached with chlorineor any other oxidizing agent.

The yarns thus treated lose approximately 1% in weight in the first bathand 2% in the bleaching bath. They are remarkably strong and cotton inparticular after this treatment lends itself admirably to all dyeing,weighting and calendering operations. The like applies for all the otheryarns.

Moreover, with the process according to the present invention, the yarnsare eificiently degummed or scoured.

Example Taking cotton by way of example: a bath is prepared containingfor litres of water, two kilograms of aluminum sulphate and. twokilograms of sodium bisulphite. The cotton hanks are immersed in thisbath being either placed in washing machines or directly soaked in vats.The cotton turns creamy at the end of a few minutes and takes on a clearand. uniform tint. If it be desired to obtain only creamy cotton, it isremoved from the bath, rinsed, strained and dried. If, on the contrary,it is desired to secure a white color, the cotton is bleached by one ofthe processes commonly used in bleaching. The cotton thus treated isreadily bleached and a small quantity of chlorine may be used, forexample, in a bath containing one or two per cent. The like applied inthe case of other fibres.

I claim:

1. A process of treating yarns which consists in soaking the yarn in thecold state in a bath containing a mixture of aluminum sulphate and areducing salt derived from sulphur.

2. A process of treating yarns which consists in soaking the yarn in thecold state in a bath containing a mixture of aluminum sulphate and oneof the sulphites of an alkaline base.

3. A process of treating yarns which consists in soaking the yarn in thecold state in a bath containing a mixture of aluminum sulphate andsodium bisulphite.

4. A process of treating yarns which consists in soaking the yarn in thecold state in a bath containing a mixture of aluminum sulphate andsodium hyposulphite.

5. A process of treating yarns which consists in soaking the yarn in thecold state in a bath containing a mixture of aluminum sulphate andsodium sulphite.

6. A process of treating yarns which consists in soaking the yarn in thecold state in a bath containing a sulphate of aluminum and. an alkalisalt of sulphurous acid.

7. A process of treating yarns which consists in soaking the yarn in thecold state in a solution of 2 parts aluminum sulphate, 2 parts sodiumbisulphite, in 100 parts of water.

8. A degumming process for yarns which consists in soaking yarns in thecold state in a dilute solution of an aluminum sulphate and an alkalisalt of sulphurous acid.

9. A degumming process for yarns which consists in soaking yarns in thecold state in a dilute solution of aluminum sulphate and sodiumbisulphite in water.

' LOUIS PEUFAILLIT.

